Controller for electric motors



Aug, 18 1925. 1,549,921

F. H. QBERSCHMIDT CONTROLLER FOR ELECTRiIC MOTORS Filed Sept. 28. 1922 A'I'TORNIJY Patented Aug." 18', 19 25.

- UNITED STATES" PA ENT OFFICE.

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: Application filed Se tem e 28,1922. SQIMLKO. camel.

, To ail echom it my concern:

SCHMIDT, a citizen of the hogs and State of Ohio,

a full, clear, concise,-

reference bein Be it known that I,- FRnnnRIoK'H. OB I United States,residing at Cleveland, in .the county of Guyahave invented new anduseful Improvements in Controllers for Electric Motors; of fwhichthefollowing is drawing, forming. a part of this specificat-IOII; 1 v pThis invention relates to improvements in controllers for electricmotors.

In practice there are numerous instances where electric motors are emloyed to drive machinery, such as tire mac ing frequent reversals andquick, stopping at will or incidentalto reversals and the so controlled.

present invention has amongits objects to provide asimple, controllerwhereb Other obi'ects and advantages of the inventionwil hereinafterappear.

The accomggrliying drawing illustratesza preferred eni l'lnent of theinvention and the same will now be described it being 'understood thatthe embodiment illustrated is- .susceptible of various modificationsfallingv offthe controller alone. t J 4 Referring to Fig. 1 the'sameillustratesa controller for a said controller vinc [switches land 2 toofxthe motor circuit, I if'said motor underlthe control of push and'4..The switches '1" provided with operat= 4 ing windings '1 an 2fi andwithv auxiliary within the scope of the appended claims. I

In the drawing,

Figure 1 is a diagrammatic view'of'thecontroller and its controlledmotor; and

v Fig. 2. is a simplified diagrammatic-view uir-rel cage 'motor- M,uding electromagnetic control the continuity and toiefiect reversalsbutton. switches 3 and 2 are respectivelcontacts'l and 2" res ctively'to complete maintaining circuits for said windings.

' The push button switches 3 and 4 are respectively provided with twosets of stationary contacts to be bridged alternatively.

The switches 3 and 4 when depressed respectively provide forenergization of switches 1 and 2 through the down contacts ofthe formerswitches. 0n the other hand the up f contacts of switches 3 and 4areincluded qthef maintaining circuits of switches and and exactdescript on; had to the accompanying arm'sinayjbe oscillated by saiconvenient and reliable. such machinery may be and function to il 1eferrln contacts of switch .3 .,by

. through the upper; contacts apparent from the sim- 1 maintainingcircuits of switches 1 and 2 respectively. I

Switches '5 and 6 tionally engaged therewith b clam s 8 or otherpreferred means whereb each hf said shaft for engagement'with stationarycontacts 9 and 10 selectively; said contacts. servingassto s for saidarms to arrest the same independently of saidshaft. The

shaftoperatively connected to the motor or to a reversing part of thedriven machine of switches 5 and 6 will be engaged-with their stationarycontacts whereby the arms alternate K A t I upon successive reversals ofthe motor'an driven machine.

The reversing switches 1" and 2 are em-.

plo ed to plu the motor M for etc in an the switc es 5 and 6 areprovided maintain suchswitches energized when so employed until themotor isbrought torest. As a'forestated the switches 5 and 6 are incirc'uit with the windings of'switches 1 an 2 frespectivel y and; aswill be under both switches Hand 6 are closedthroughout operation of themotor in either direction maintain the switch ener 'zed until the motoris brought to a standstill-and then tends to rotate v v comprise contactarm's osclllatably mounted on ashaft 7 but fric-' plugging I shaft 7 maycomprise an; extenslon. of the motor shaft or-a separate' inaf,

reverse direction whereupon the switches ,5

and 6 are inunediate'lyshifted to de-energiz'e the. fileuggmg switch [1or 2 as the case now tofFig. 2 which shows in sim lified orm'the samecircuit connections as 15;. 1 depression of. push-button switch 3completes 'the circuit of; winding 1 of switch 1, said circuit extendingfrom line L condu if 11 through'u per contacts of switch 4 conductor 12t rough lower to line L.

14v through winding I 1 On the other liami depression of switch 4completes v of switch 2 said the circuit 10f winding 2?, ciruitextendingfrom linievL' by conductor I of switch 3 by conductor ,16 throughthelower. contacts of conductors 13 and switch 4 by conductors 17 and 18through suming energization of switch '1 for plugging followingenergization and de-energization of switch 2 it will be observed thatswitchl will be m'aintained'energized until the torque of the motor isreversed wherer. upon the arm of switch 5 will be shifted to,

momentarily interrupt circuit for de-energization of switch 1. Thereuponassuming switch 2 to be open the motor is rendered idle. On the otherhand assuming retention of switch 3 until after reclosure of switch 5the switch 1 willbe maintained energized 25.

for continued reverse operation of the motor. More specificall theswitch 1 will be maintained ener ize until push button switch 4 isdepressed to interrupt the circuit includin% contacts 1 and switch 5.

r uch depression of switch 4 to de-energlze switch 1 also energizesswitch 2 as aforedescribed and if switch 4 is then released switch 2vwill bring the motor to rest after which it will be de-energized byswitch 6 in the same manner that switch 1 is de-energized by switch 5.If on the other hand switch 4 is held" depressed until switch 6 isreclosed the motor will continue to operate in a reversedirectionpending depression of switch 3 eithervto stop the motor or again reversethe latter. The maintaining circuit of switch'2 as willlbe apparentextends through the upper contacts of switch 3, contacts 2 and switch 6in series whereby the control I of winding 2 is in all respects similarto the control of winding 1". v

Manifestly if it .be desired to stop the motor when operating in eitherdirection without plugging said motor this may be accomplished bydepressing the proper push button switch to its intermediate positionout of contact with all stationary contacts. The depressed switch thenmerely de-energizes the reversing switch last closed thus permittin themotor to drift until it comes to rest. & will thus be apparent that theve sim ple apparatus described afiords very exible and convenientcontrol startin reversin and stopping requirin use of on y two pusbutton switches. oreover inasmuch as plugging efi'ects quick stopping ofthe motor thepush button switches only require retention in theirdepressed positions for very brief periods to effect reversals of themotor. The power circuits for the motor are shown in heavy lines, Fig.1, and being well known and obvious will not be described herein. Aswill be apparent other types of motors may besubstitued for thatillustrated and the power connections maybe varied as desired. Also aswill be'apparent provision maybe made foraflording speed control of themotor if desired.

What I claim as new anddesire to secure by Letters Patent is:

1. In a motor controller in combination manually operable contacts andmeans controlled thereb to establish reversing circuit connections fbrthe controlled .motor for plugging and" running in either direction,

said means including means operable auto matically to arrest the motorfollowing plugging, and said contacts when operate to effect pluggingbeing releasable to permit operation of said arresting means and beingrestrainable in plugging relation to render said arresting meansineffective.

2. In amotorcontroller in combination means to establish reversingcircuit connections for the controlled motor for plugging and running ineither direction, said means including means tending to arrest the motorfollowing plugging thereof and selectively operable switches controllingsaid means to effect reversals at will, each of said switches beingoperable to render the second mentioned means effective or ineffectiveat will.

3. In a motor controller in combination means to establishreversingcircuit connec- I tions for the controlled motor for pluggingand running in eitller direction, said means including means tending toarrest the motor following plugging thereof and selectively operableswitches controlling said means to effect reversals at will eithersubject to or independent of the influence of said stopping means, saidswitches being of the push button type.

4. In a motor controller in combination means to establish reversingcircuit connections for the controlled motor for plugging and running ineither direction, said means including means tending toarrest the motoru following plu ging thereof'and selectively operable switc escontrolling said means to effect reversals at will either subject to orindependent of the influence of said stopping means, said switches beingof the push button type, and being also selectively operable to stop themotor at will independently of the aforesaid stoppin means.

5. In a motor .contro ler in combination I electro-responsive reversingswitches for the controlled motor to effect plugging and reverseoperations thereof, means associated with said switches to de-energizeeach following plugging thereby and push button operated switches to bedepressed to energize said reversing switches respectivel and to bemaintained depressed temporarily to

